The "Device select ID" are the 3 bits in slave address which are represented by the status of A2, A1, A0 input pins.

A2, A1, A0 pins are used to select between the multiple slave devices connected on the same bus. Since there are 3 pins, a maximum of 8 devices can be connected on the same bus. If these pins are not connected or left floating, the default state is LOW. Hence the "Device select ID" bits = 000.